"Who writes this crap?" Jess implored

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The songbird's sister Ashlee Simpson Wentz was recently given the boot from the CW soap "Melrose Place" and, after using Twitter to promote her sister's show, the elder Simpson began to tweet her discontent.

The songbird's sister, Ashlee Simpson-Wentz, was recently given the boot from the CW soap "Melrose Place" and, after using Twitter to promote her sister's show, the elder Simpson began to tweet her discontent.

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"CW catching up on MP," she posted on her Twitter page early Monday. "who writes this crap? i have had bad scripts to work with, but this? thank God my sister is amazing and you got some press."

Ashlee was reportedly canned because producers thought the mother of 11-month-old Bronx needed to work on her acting chops.

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"They hired her because they needed a good name to help create buzz," a snitch told Usmagazine.com. "But she was embarrassingly bad. Producers cut her down as much as possible."

A second source told the magazine that everyone was afraid to tell Ashlee the truth about her acting skills.